Compilare: user.cpp: In function ‘void lee()’: user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( j = 0 ; j < lx.size();j++) ^ user.cpp:21:34: warning: variable ‘ok2’ set but not used [-Wunused-but-set-variable] int ux,uy,xx,yy,ok = 1,x,y,j,ok2,d; ^ user.cpp:21:38: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int ux,uy,xx,yy,ok = 1,x,y,j,ok2,d; ^ user.cpp: In function ‘int main()’: user.cpp:58:14: warning: unused variable ‘d’ [-Wunused-variable] int i,j,k,d,x,y; ^